For a number of reasons, we can't use an air conditioner, but our apartment is like a greenhouse and it's been almost 100 degrees every day for weeks now. This will only cool one room at a time and we put a lot of ice in the water tank, but it cools better than a fan (which can barely cut the blanket of heat). I like it at night in the bedroom to keep my 3-month-old baby comfortable. The shortest way to review the product: before the evaporative air cooler, when I came home from work, the heat made me want to die. Now I come home from work after my husband has been running it a few hours and while it's no a/c, I no longer want to die.